PROCESS FOR PRODUCING POLARIZER, POLARIZER, POLARIZING PLATE, OPTICAL FILM, PROCESS FOR PRODUCING COMPOSITE POLARIZING PLATE, COMPOSITE POLARIZING PLATE AND IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a process for producing a polarizer which nearly simultaneously brings liquid into contact with a hydrophilic polymer film and stretches the hydrophilic polymer film in a widthwise direction by a tenter method or the like by using a small and simple production apparatus.;SOLUTION: The production process includes a widthwise direction stretching step of holding both ends in the widthwise direction of the continuously supplied hydrophilic polymer film 1 by a holding means 2, allowing the holding means 2 to travel in a longitudinal direction of the film 1, bringing the film 1 into contact with the liquid and further moving both of the holding means 2 holding both ends of the film 1 in its widthwise direction to the outside of the film 1 in its widthwise direction to stretch the film 1 in its widthwise direction and a dying step of dying the film 1 with a dichroic substance. In the widthwise direction stretching step, the contact of the liquid is carried out by either spraying or applying the liquid. The widthwise direction stretching step is carried out in either the drying step or another step different from the dying step.;COPYRIGHT: (C)2009,JPO&INPIT